Improvement in vises



' TOANLL WHOM 1'1.'- MAY ooNOsnN:

MASON yPRENTISS, OF canins-Ilma, NEW YORK.

Lenen Parent No. 75,576, ma March 17, 186s.

` IMPROVEMENT '1N vlsns.

@the 'Stimuli nfemh it in there ettert mimi ant makingl putt ntthe'ls'sme.'

-Bef-it known that I, MAsON FENTISS', of Cambridge, inl the county ofWashin'gton, andvState of New York',

have invented av'n'ew and us'eful Improvement in Vises; and I d o hereby declare .that lthe following is a "full, clear;undernet-description thereof, which will enable those skilled inthe art tolmake andusethesame, refer` ence beinghad to the accompanying drawings forming part of this specification. l

`Th'isinv'ention relates to a neu/and useful improvementvin visos for holding either ironfor woodwork; and

it consists inan arrangement. whereby the ba'ck jaw of the vise; is made adjustable, so thatftaperirig or wedgeshaped pieces of iron lor wood maybe Vheldbetween the two jaws, as 'will be hereinafter more fuly described.

i Figure 1 represents a top viewof thevise attached to a b ench.V v

, Figure 2 is a vertical section of the same-through the line zur. l Y

Similar letters of reference indicate corresponding parts.r l

. A represents the'bench to which thefvise is attached.; B is thfe outer jaw, to which is attached the viscscre`w`, by which itis moved bacl` and forth in the' usual manner; C is the screw, and D is the nut, which nut is stationary onithe bench or bed of the vise; Eis the bnckljnw; F i's the body of the-vise,-which receives the' lshaft B'.of thefou'terrjaw. The jaw E rests upon thc top 'of F, and is attached to F, :as seen in 'sectional drawing, iig. 2. There is a'half circle on the under sident' the jaag, (as indicated by the dotted lines'in iig. 1,) upon t which tbe jaw turns. l By thus arranging the'jnw to turn on ailiirg'e circle instead of'lon n pivot, theadjustment is much more perfectly made, andthe utility andfdurability otthe vise greatly increased, The back portion of this4 adjustable jaw is rebated so as to ft a groove' in the bed, as seen at g, and the circlelfat la. is secured to the lfront part of the-bed in' a similar. manner. J represents a circular slot through' the 'back part of the jaw E, and if is a stationary pim-which is fast to F, and which 'passes through the slot.A l

Figure 3 is a hey, which is dropped over the pin in the slot'wheniit is desiredto hold the jaws of tbevise `The pini may extend up and-have a -nut and washer upon it, if necessary, to hold thejaw firmly in any desired position. f Y It is designed tovmake this vise of ca st iron or other suitable metal, and, by the adjustment ofthe back jaw, as described, the vise will be found-.quiteas durable as with the ordinary fixed jaw-,.and-much more useful,l

especially in machine-shopauvhere it is so frequently necessary to held tapering keys and other tapering and i irregularly-formed articles.

Having thus vdescribed my iuventiorn claim as new, vand desire to secure by Letters Patent-. l i l The improved vise herein described, .its several parts being constructed and ,arranged substantially as set forth. i i

MASON P'RENTIss.

' 'Witnesses 4 BENJAMIN HALL',

ELLERY S. ROBERTSON. 

